m41st87w STMicroelectronics, m41st87w Datasheet - Page 37

• Manufacturer Part Number: m41st87w
• Description: 5.0, 3.3, Or 3.0v, 1280 Bit 160 X8 Secure Serial Rtc And Nvram Supervisor With Tamper Detection
• Manufacturer: STMicroelectronics

Table 17. DC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
I
V
OUT1
V
I
I
V
V
I
V
Sym
BAT
V
OHB
R
I
I
I
OUT2
LO
V
V
V
OH
LI
CC1
CC2
V
PFI1
PFI2
PFD
BAT
SW
OL
SO
10. For IRQ/OUT, SQW/FT (if SQWOD = '1'), PFO
(3)
IH
IL
(4)
(2)
2. Measured with V
3. RSTIN1 and RSTIN2 internally pulled-up to V
4. Outputs Deselected.
5. External SRAM must match RTC SUPERVISOR chip V
6. For rechargeable back-up, V
7. For PFO
8. Conditioned output (E
9. TP
(7)
(8)
(5)
duce battery life.
Battery Current
OSC ON
Battery Current
OSC OFF
Supply Current
Supply Current
(Standby)
Input Leakage
Current
Input Leakage
Current (PFI)
Output Leakage
Current
V
(Active)
V
(Battery Back-up)
Input High Voltage
Input Low Voltage
Battery Voltage
Output High Voltage
Pull-up Supply
Voltage (Open
Drain)
V
up)
Output Low Voltage
Output Low Voltage
(Open Drain)
Power Fail Deselect
PFI Input Threshold
PFI Hysteresis
PFI Input Threshold
PFI Hysteresis
Battery Back-up
Switchover
Switch Resistance
on Tamper Pin
CLR
OUT
OUT
OH
output can source –300µA (typ) for V
Parameter
(Battery Back-
1
Current
Current
and PFO
OUT
(10)
2
(if PFOD = '0'), SQW/FT (if SQWOD = '0'), and TP
and E
CON
) can only sustain CMOS leakage current in the battery back-up mode. Higher leakage currents will re-
CON
BAT
T
V
V
IRQ/OUT, RST, F
A
SCL, SDA = V
Test Condition
OUT2
OUT1
open. Not including Tamper Detection Current (see
I
OUT2
(max) may be considered V
0V
0V
= 25°C, V
I
V
V
OH
V
V
I
I
THS Bit = 0
THS Bit = 1
f = 400kHz
OL
PFI Rising
PFI Rising
V
OL
CC
CC
CC
CC
BAT
> V
> V
= –1.0mA
= –1.0µA
V
V
0.3V
= 3.0mA
= 10mA
= 3V(W)
= 3V(W)
= 5V(Y)
= 5V(Y)
IN
IN
BAT
CC
= 3V
A
BAT
CC
CC
= –40 to 85°C; V
V
V
– 0.3V
– 0.3V
1
through 100K resistor. WDI internally pulled-down to V
CC
CC
CC
= 2.9V.
and PFO
= 0V,
(9)
(1)
32k
–
CC
0.7V
2
1.225
1.225
specification.
(if PFOD = '1'), RST, SDA, and F
–0.3
4.20
4.50
Min
–25
2.5
2.4
CC
CC
CC
.
= 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
M41ST87Y
1.250
1.250
4.35
4.60
Typ
500
3.0
2.9
2.5
50
20
20
CLR
2
pins (CMOS).
0.3V
V
1.275
1.275
3.5
Max
4.50
4.75
700
175
100
500
CC
1.4
0.3
5.5
0.4
0.4
±1
25
±1
70
70
1
Table 4., page
(6)
CC
+
0.7V
1.225
1.225
–0.3
2.55
2.80
32k
Min
M41ST87Y, M41ST87W
–25
2.5
2.4
pins (Open Drain).
CC
M41ST87W
18).
1.250
1.250
2.62
2.88
Typ
500
SS
3.0
2.9
2.5
50
20
20
2
through 100K resistor.
0.3V
V
3.5
1.275
1.275
Max
0.75
0.50
2.70
3.00
700
100
100
500
CC
0.3
3.6
0.4
0.4
±1
25
±1
70
70
(6)
CC
+
Unit
37/42
mA
mA
mA
mV
mV
nA
nA
µA
nA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
V